Match List-I with List-II
List-I (Genetic status of a crop) & List-II (Nomenclature)
(A) Homozygous- Homogeneous & (I) Hybrid
(B) Homozygous- Heterogenous & (IV) Multiline variety
(C) Heterozygous- Homogeneous & (III) Pure line variety
(D) Heterozygous- Heterogenous & (II) Synthetic variety
List-I (Genetic status of a crop) & List-II (Nomenclature)
(A) Homozygous- Homogeneous & (I) Hybrid
(B) Homozygous- Heterogenous & (IV) Multiline variety
(C) Heterozygous- Homogeneous & (III) Pure line variety
(D) Heterozygous- Heterogenous & (II) Synthetic variety
Show Hint
- Homo-Homo: Pure line variety Inbred line.
- Hetero-Homo: $F_1$ Hybrid (all plants are identical but genetically heterozygous).
- Homo-Hetero: Multiline (mixture of different pure lines).
- Hetero-Hetero: Synthetic Composite Open-pollinated variety.
- (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
- (A) - (II), (B) - (I), (C) - (III), (D) - (IV)
- (A) - (III), (B) - (IV), (C) - (II), (D) - (I)
- (A) - (III), (B) - (IV), (C) - (I), (D) - (II)
The Correct Option is D
Solution and Explanation
In plant breeding, crop varieties are classified based on their genetic composition (homozygous versus heterozygous) and population structure (homogeneous versus heterogeneous).
Step 2: Detailed Explanation:
Let us define and match each genetic status with its correct category:
- (A) Homozygous-Homogeneous $\rightarrow$ (III) Pure line variety:
A pure line variety consists of self-pollinated progeny derived from a single homozygous homogenic selfed plant.
All plants in the variety are genetically identical (homogeneous) and completely homozygous.
- (B) Homozygous-Heterogenous $\rightarrow$ (IV) Multiline variety:
A multiline variety is a planned mixture of several closely related, homozygous pure lines (isolines) that differ primarily in their disease resistance genes.
Since each individual line is homozygous, but the mixture contains different lines, the population is homozygous but heterogeneous.
- (C) Heterozygous-Homogeneous $\rightarrow$ (I) Hybrid:
An $F_1$ hybrid is produced by crossing two distinct, homozygous inbred parental lines.
Every single $F_1$ plant has the same genetic constitution, making the crop highly uniform (homogeneous), but each plant is highly heterozygous at all loci.
- (D) Heterozygous-Heterogenous $\rightarrow$ (II) Synthetic variety:
A synthetic variety is developed by intermating a set of pre-tested, open-pollinated parental lines.
The resulting population consists of genetically diverse plants (heterogeneous) that are highly heterozygous at their loci.
This results in the sequence: (A)-(III), (B)-(IV), (C)-(I), (D)-(II).
Step 3: Final Answer:
The correct matching sequence is (A) - (III), (B) - (IV), (C) - (I), (D) - (II).
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